| USRP Hardware Driver and Device Manual Version: 4.10.0.0 UHD and USRP Manual |

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FPGA IP Blocks

# RFNoC Blocks

The RFNoC FPGA IP blocks that ship with UHD are listed below. These blocks can be incorporated into a custom FPGA design by instantiating them in the respective image core yaml file that defines that FPGA design.

## In-Tree Blocks

The list of RFNoC IP blocks that are maintained within the UHD repository are listed below.

Name (Link to Documentation) | File Name | Description
--- | --- | ---
Add / Subtract (Manual) | addsub | Computes the sum and the difference of two input streams
Digital Down Conversion (Manual) | ddc | Frequency shift and integer sample rate down conversion
RAM FIFO (Manual) | axi_ram_fifo | A large FIFO buffer that uses DRAM on the USRP for storage.
Digital Up Conversion (Manual) | duc | Integer sample rate upconversion and frequency shift
FFT (Manual) | fft | (i)FFT with cyclic prefix insertion and removal
FIR Filter (Manual) | fir_filter | FIR filter with compile time configurable length and run time configurable filter coefficients
Fosphor (Manual) | fosphor | Computes histogram and waterfall of FFT-converted input packets
Keep One in N (Manual) | keep_one_in_n | Keeps 1 sample or packet and drops the following N-1 samples or packets
License Checker (Manual) | license_check | Reads and evaluates license keys
Log Power (Manual) | logpwr | Computes an estimate for 1024 * log2(i^2 + q^2) of a complex-valued input sample
Moving Average (Manual) | moving_avg | Computes the moving average of an input stream.
Null Source / Sink(Manual) | null_src_sink | Acts as FPGA data source, sink or input-output loopback
Radio (Manual) | radio | Interface between RFNoC framework and RF hardware, providing radio control and data streaming capabilities
Replay (Manual) | replay | Records data to DRAM memory or plays data back from DRAM memory
Signal Generation (Manual) | siggen | Generates constant, sinusoidal or uniformly distributed noise signals
Split Stream (Manual) | split_stream | Replicates a single input stream into multiple output streams
Switchboard (Manual) | switchboard | Routes any single input to any single output
Vector IIR (Manual) | vector_iir | IIR filter with a single feedforward and feedback tap and a variable delay
Window (Manual) | window | Multiplies an input signal by a shaping function (window)

## Out-Of-Tree Blocks

Out-of-tree blocks are RFNoC blocks that are developed and maintained outside of the main UHD repository here: https://github.com/EttusResearch/rfnoc-oot-blocks

Name (Link to Documentation) | File Name | Description
--- | --- | ---
Aurora (Manual, Getting Started) | aurora | Remote Tx / Rx streaming between X4xx and non-UHD (FPGA) devices using the Aurora protocol